CDXC
On Converting between Arabic and Roman Numbers we get: 490 in roman numerals is written as : CDXC where 400=CD XC=90.
40 = XL
Not a proper Roman numeral. D is 500. X is ten It could be 510. Or it could be in improper attempt to write 490 (which would be CDXC).
The Roman numeral CDXC represents the number 490. C (100) is subtracted from D (500) to give 400, and XC (90) is added to 400 to get 490.
XD = 490
CDXC
mcmxliv
2010 in roman numerals = MMX
On Converting between Arabic and Roman Numbers we get: 490 in roman numerals is written as : CDXC where 400=CD XC=90.
40 = XL
Not a proper Roman numeral. D is 500. X is ten It could be 510. Or it could be in improper attempt to write 490 (which would be CDXC).
The Roman numeral CDXC represents the number 490. C (100) is subtracted from D (500) to give 400, and XC (90) is added to 400 to get 490.
XXX-XV-MMX
It is: XVIII-I-MMXII
XD = 490
It was the equivalent of 490 in the times of the ancient Romans but the modern way of writing 490 in Roman numerals is now CDXC
XD is not in the standard form for a Roman numeral, but I would guess its value is 490. It should be written as CDXC